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Asked: 2026-05-27T04:14:54+00:00

When file1.c includes inc.h (containing the include guard #ifndef INC_H ) for the first

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When file1.c includes inc.h (containing the include guard #ifndef INC_H) for the first time, the #define INC_H is performed. But now, when another file2.c includes the same inc.h, is the macro INC_H already defined, all it’s the same story and previous definition is not propagated here?

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  1. Editorial Team

    But now, when another file2.c includes the same inc.h, is the macro INC_H already defined,

    Yes and No. It depends.

    • If file2.c includes some header which includes inc.h, then yes, INC_H is already defined for file2.c. This is true for any level of inclusion.

    • Else, no it is not already defined.

    Guards prevent header from being included in a file, indirectly or directly, more than once!

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